iosr-JMCE   Volume-23 ~ Issue-1 ~ Jan. – Feb. 2026

Abstract: Background: Reinforced concrete cylindrical shell columns are extensively used in water infrastructure, industrial facilities, marine structures, and high-rise buildings due to their high load-carrying efficiency. However, under axial and dynamic loading, these structures are vulnerable to coupled vibration and buckling effects. Most existing studies examine modal characteristics and buckling behaviour separately, limiting understanding of their interaction. This study addresses this limitation by developing an integrated framework for simultaneous...

Keywords: Reinforced concrete cylindrical shells; Modal analysis; Buckling behaviour; Nonlinear finite element analysis; Stability assessment

[1]. Surianinov M, Neutov S, Kirichenko D, Metlizkiy V. Comparative Analysis Of The Bearing Capacity And Cracking Of Reinforced Concrete And Fiber-Reinforced Concrete Cylindrical Shells. Materials Science Forum. 2024.
[2]. Zhang H, Li Y, Chen X. Nonlinear Finite-Element Modeling Of Reinforced Concrete Columns Subjected To Combined Loading. Engineering Structures. 2020;215:110–128.
[3]. Timoshenko SP, Gere JM. Theory Of Elastic Stability. 2nd Ed. Mcgraw-Hill; 1961.
[4]. Bate SK, Foster SJ, Gilbert RI. Three-Dimensional Nonlinear FE Modeling Of Concrete Structures: Capabilities And Limitations. Computers & Structures. 2019;219:1–12.
[5]. Blevins RD. Formulas For Natural Frequency And Mode Shape. Wiley; 2015..

Abstract: This research investigates the influence of Penterclethra Macrophylla Benth Husk Ash which is the Scientific name for African Oil Bean Husk Ash (OBHA) and Artocarpus Altilis Husk Ash which is also the Scientific name for Breadfruit Husk Ash (BHA) as partial replacements for Ordinary Portland Cement (OPC) on slump, setting time, and mechanical properties of Concrete, specifically compressive, flexural and split tensile strengths. Fine aggregate...

Keywords: Breadfruit husk ash, Compressive Strength, Flexural Strength, Mathematical modeling, Oil bean husk Ash, Setting time, Split tensile Strength and R-Programming

[1]. Adeshina F., Olawale S. O., Mohammed Yisa (2018). Arid Zone Journal Of Engineering,
[2]. Technology And Environment; Vol. 14(4): 614-628Copyright © Faculty Of Engineering, University Of Maiduguri, Maiduguri, Nigeria. Print ISSN: 1596-2490, Electronic ISSN: 2545-5818
[3]. ASTM C 618 : 2023: Standard Specification For Coal Ash And Raw Or Calcined Natural Pozzolan For Use In Concrete
[4]. Bahri Syamsul (2017). Mechanical And Durability Properties Of High Performance 100 Mpa Rice Husk Concrete, Thesis Engineering University Of Malaya Kuala Lumpur,42-51
[5]. Eloget M. O., S. O. Abuodha, And M. M. O. Winja (2021). “The Effect Of Sisal Juice Extract Admixture On Compressive And Flexural Strength Of Cement Concrete”, Eng. Technol. Appl. Sci. Res., Vol. 11, No. 2, Pp. 7041–7046..

Abstract: This paper examines the structural model analysis of a locally made quadcopter using SolidWorks, a comprehensive computer-aided design and engineering software. The aim is to ensure the stability of the quadcopter during flights and landing. The study focuses on the design and materials used for the quadcopter and their effects on its performance. Modal analysis is carried out on the quadcopter to determine the vibration characteristics...

Keywords: Quadcopter, Modal analysis, Static analysis, Modelling, SolidWorks

[1] Siddiqui W, Srivastava M, Verma V (2024) Design And Fabrication Of FPV Drone. Journal Of Mechanical And Construction Engineering Vol. 4(1), February 2024.
[2] Zhang Y, Li Q, Wang Z (2021). Custom Frame Design For Agricultural Drones: A Solidworks Simulation Study. Journal Of Agricultural Engineering Research 45(1), 67-76.
[3] Hossain M, Rahman M, Karim M (2017). Crashworthiness Analysis Of Quadcopter Frames Using Solidworks. International Journal Of Crashworthiness 22(3), 255-265.
[4] Elmeseiry N (2021), A Detailed Survey And Future Directions Of Unmanned Aerial Vehicles With Potential Applications. Journal Of Aerospace Engineering, Vol 8(1), November 2021.
[5] Singh R, Kumar V. (2020) Static And Dynamic Analysis Of Quadcopter Frames: A Solidworks Approach. Journal Of Aerospace Engineering 27(2), 112-121.

Abstract: This study presents a structural analysis of the static flexural behavior of continuous thin-walled bridge decks using the Finite Element Method (FEM). A MATLAB programs was developed: implementing a 12-degree-of-freedom rectangular plate element for FEM. The code was validated against the exact solution of Timoshenko and Woinowsky-Krieger for a three-span isotropic deck with various end supports. A convergence study identified, Mesh...

Keywords: FEM; Exact Method Bridge Deck; Deflection; Span Moment; Shear force; Matlab

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